A Book of Proofs

The study of proof forms the foundation of mathematics. Proofs provide the framework through which mathematical statements are justified, validated, and connected to one another. Without proof, mathematics would be a collection of isolated facts; with proof, it becomes a coherent and rigorous discipline. This book, A Book of Proof, is intended as an introduction to the methods of mathematical reasoning. It begins with the fundamental concepts of logic and sets, then proceeds to the principal techniques of proof: direct proof, proof by contrapositive, proof by contradiction, and the use of counterexamples. Special attention is given to mathematical induction, a powerful method essential for establishing results about sequences, inequalities, and properties of integers. The book is designed for students encountering proof for the first time, particularly those transitioning from computational mathematics to more abstract study. The exposition emphasizes clarity and precision while also offering numerous examples to illustrate the concepts. Each chapter concludes with a set of exercises, and selected solutions are provided to support independent learning. It is my hope that this book will not only serve as a practical introduction to mathematical proof, but also foster an appreciation for the elegance and logical structure that proofs bring to mathematics.